docs: def get_decode_format(flags):
      """
      Returns a tuple of format, recognized
      """
      c_flags = flags & FMT_COMMON_MASK
      l_flags = flags & FMT_LEGACY_MASK
  
      if c_flags:
          if c_flags not in COMMON_FORMATS:
              return FMT_BYTES, False
          else:
              return COMMON2UNIFIED[c_flags], True
      else:
          if not l_flags in LEGACY_FORMATS:
              return FMT_BYTES, False
          else:
              return LEGACY2UNIFIED[l_flags], True